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<h2><a href="closure_goog_net_xpc_relay.js.html">relay.js</a></h2>

<pre class="prettyprint lang-js">
<a name="line1"></a>// Copyright 2007 The Closure Library Authors. All Rights Reserved.
<a name="line2"></a>//
<a name="line3"></a>// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);
<a name="line4"></a>// you may not use this file except in compliance with the License.
<a name="line5"></a>// You may obtain a copy of the License at
<a name="line6"></a>//
<a name="line7"></a>//      http://www.apache.org/licenses/LICENSE-2.0
<a name="line8"></a>//
<a name="line9"></a>// Unless required by applicable law or agreed to in writing, software
<a name="line10"></a>// distributed under the License is distributed on an &quot;AS-IS&quot; BASIS,
<a name="line11"></a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<a name="line12"></a>// See the License for the specific language governing permissions and
<a name="line13"></a>// limitations under the License.
<a name="line14"></a>
<a name="line15"></a>/**
<a name="line16"></a> * @fileoverview Standalone script to be included in the relay-document
<a name="line17"></a> * used by goog.net.xpc.IframeRelayTransport. This script will decode the
<a name="line18"></a> * fragment identifier, determine the target window object and deliver
<a name="line19"></a> * the data to it.
<a name="line20"></a> *
<a name="line21"></a> */
<a name="line22"></a>
<a name="line23"></a>goog.provide(&#39;goog.net.xpc.relay&#39;);
<a name="line24"></a>
<a name="line25"></a>(function() {
<a name="line26"></a>  // Decode the fragement identifier.
<a name="line27"></a>  // location.href is expected to be structured as follows:
<a name="line28"></a>  // &lt;url&gt;#&lt;channel_name&gt;[,&lt;iframe_id&gt;]|&lt;data&gt;
<a name="line29"></a>
<a name="line30"></a>  // Get the fragment identifier.
<a name="line31"></a>  var raw = window.location.hash;
<a name="line32"></a>  if (!raw) {
<a name="line33"></a>    return;
<a name="line34"></a>  }
<a name="line35"></a>  if (raw.charAt(0) == &#39;#&#39;) {
<a name="line36"></a>    raw = raw.substring(1);
<a name="line37"></a>  }
<a name="line38"></a>  var pos = raw.indexOf(&#39;|&#39;);
<a name="line39"></a>  var head = raw.substring(0, pos).split(&#39;,&#39;);
<a name="line40"></a>  var channelName = head[0];
<a name="line41"></a>  var iframeId = head.length == 2 ? head[1] : null;
<a name="line42"></a>  var frame = raw.substring(pos + 1);
<a name="line43"></a>
<a name="line44"></a>  // Find the window object of the peer.
<a name="line45"></a>  //
<a name="line46"></a>  // The general structure of the frames looks like this:
<a name="line47"></a>  // - peer1
<a name="line48"></a>  //   - relay2
<a name="line49"></a>  //   - peer2
<a name="line50"></a>  //     - relay1
<a name="line51"></a>  //
<a name="line52"></a>  // We are either relay1 or relay2.
<a name="line53"></a>
<a name="line54"></a>  var win;
<a name="line55"></a>  if (iframeId) {
<a name="line56"></a>    // We are relay2 and need to deliver the data to peer2.
<a name="line57"></a>    win = window.parent.frames[iframeId];
<a name="line58"></a>  } else {
<a name="line59"></a>    // We are relay1 and need to deliver the data to peer1.
<a name="line60"></a>    win = window.parent.parent;
<a name="line61"></a>  }
<a name="line62"></a>
<a name="line63"></a>  // Deliver the data.
<a name="line64"></a>  try {
<a name="line65"></a>    win[&#39;xpcRelay&#39;](channelName, frame);
<a name="line66"></a>  } catch (e) {
<a name="line67"></a>    // Nothing useful can be done here.
<a name="line68"></a>    // It would be great to inform the sender the delivery of this message
<a name="line69"></a>    // failed, but this is not possible because we are already in the receiver&#39;s
<a name="line70"></a>    // domain at this point.
<a name="line71"></a>  }
<a name="line72"></a>})();
</pre>


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